Scanning Electron Microscopy of Flyspeck of Apple, Pear, Japanese Persimmon, Plum, Chinese Quince, and Pawpaw. H. Nasu, Plant Pathologist, Okayama Prefectural Experiment Station, Sanyo-cho, Okayama, 709-08, Japan. H. Kunoh, Associate Professor, Laboratory of Plant Pathology, Faculty of Agriculture, Mie University, Tsu-city, 514, Japan. Plant Dis. 71:361-364. Accepted for publication 17 October 1986. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-0361.

Flyspeck of apple, pear, Japanese persimmon, plum, Chinese quince, and pawpaw was observed by scanning electron microscopy. Fungal structures formed and behaved similarly on all plant surfaces examined. Hyphae from germinated conidia grew on waxy bloom of the respective plants, degenerated bloom crystals around them, and aggregated to form sclerotiumlike structures on plant surfaces. Waxy bloom crystals disappeared along the hyphae. Hyphae and sclerotiumlike structures were covered with a thin film.